Hundreds of thousands of young people filled a vast field on the outskirts of Rome on Saturday to see Pope Leo, in the largest event yet of the new Catholic pontiff's tenure, as part of a special weekend aimed at energizing Catholic youth.

Up to a million young Catholic believers are expected Saturday for a nighttime vigil led by Pope Leo XIV, the culmination of a weeklong pilgrimage, a key event in the Jubilee holy year. The “Jubilee of Youth” — when the Vatican invites Catholics ages 18 to 35 to the seat of the global Church’s power — has seen thousands of young pilgrims from around the world flood Rome this week.